The Sony Alpha a7S Mirrorless Digital Camera features a full-frame 12.2MP Exmor CMOS sensor and BIONZ X image processor to enable notable video and still image quality with an expansive dynamic range, low noise, and extended sensitivity to ISO 409600. At the sensor level, this full-frame sensor features a unique on-chip gapless lens design, which incorporates small lenses between neighboring pixels in order to increase light-gathering efficiency and promote greater image quality across the entirety of the sensor plane. The sensor and processor combination also avails a wealth of speed throughout the camera system, including a top continuous shooting rate of 5 fps, support for 4K video recording, and a fast 25-point contrast-detection AF system with sensitivity to -4 EV.

Beyond its still image performance, the a7S is also quite adept in regard to recording video. It supports recording uncompressed 4:2:2 4K video to an optional external recorder, as well as full HD 1080 video in the high-quality XAVC S format at 50 mbps in multiple frame rates. Extending the video recording capabilities is support for the S-Log2 gamma, which helps to expand the effective dynamic range during recording, as well as picture profile options, time codes, and zebra and marker display aids. Sound can be recorded in the AAC/Linear PCM format via the internal stereo microphone, with a built-in headphone jack for on-board monitoring, or via an external microphone.

Rounding out the a7S's imaging capabilities, both a 3.0" 921.6k-dot tilting LCD monitor and 2.36 million-dot OLED electronic viewfinder are available for image monitoring and review. Built-in Wi-Fi connectivity, with support for NFC, is available, too, for instant sharing of imagery from the camera as well as remote camera control from a linked mobile device.

Full-Frame Exmor Sensor and BIONZ X Image Processor

Incorporated within the sleek body design is a 12.2MP full-frame Exmor CMOS sensor and BIONZ X image processor, which work together to enable an expansive dynamic range with minimal noise and notable sensitivity. The a7S features a native sensitivity range from ISO 100-102400, which is further expandable to ISO 50-409600. Coupled with the large individual pixel size the 12.2MP sensor affords, this camera is well-suited to use in low-light conditions.

The sensor's design also features a new-generation RGB color filter array, as well as a gapless on-chip lens design. Together, these two technologies enable truly efficient light-gathering abilities that further reinforce the low noise, high-sensitivity design. Furthermore, an anti-reflective coating has also been applied to the seal glass of the image sensor to minimize surface reflections, glare, and ghosting for contrast-rich, color-neutral imagery.

The sensor and processor combination also avail a wealth of performance-related benefits to still shooting, including a Speed Priority continuous shooting rate of 5 fps, or a 2.5 fps shooting rate with continuous AF. The contrast-detection AF system employs 25 distinct points to quickly and precisely acquire focus in light levels as low as -4 EV to support working in a wide variety of shooting conditions.

Optimized for 4K and Full HD Video Recording

The entire width of the full-frame sensor is utilized during 4K video acquisition, alleviating the need for cropping or line skipping. This results in the ability to utilize information from each individual pixel and truly reap the benefits of the large sensor size. This ability to utilize full pixel read-out, without pixel binning, enables users to produce full HD and 4K video output with reduced moiré, aliasing, and false color artifacts.

When working in video mode, the ability to record uncompressed 4K video at QFHD (3840 x 2160) in 4:2:2 to an external recorder via HDMI connection is possible, as well as the option to record full HD (1920 x 1080) at 60p, 60i, 30p, and 24p directly to an in-camera memory card. Both full-frame and APS-C video modes can be utilized and, when working in APS-C crop mode, HD 720p video can be recorded at 120 fps for a 5x slow-motion effect. In addition to the conventional AVCHD and MP4 formats, full HD recording is also supported in the high-quality XAVC S format with a data rate of 50 mbps.

Additional Video Features

As used in Sony's line of professional video cameras, the a7S incorporates S-Log2 gamma, which is able to expand the effective dynamic range by 1300% to increase detail in both shadows and highlights. Dedicated picture profiles settings further allow users to control a variety of video settings, such as gamma, black, level, and color adjustments, which can all be saved for use in multi-camera setups.

Benefitting the editing process, full HD and 4K base band HDMI output is possible as well as the use of time codes during recording. Synchronous recording is available with compatible devices and both marker and zebra aids can be seen on external displays as well as the on-board LCD monitor and electronic viewfinder.

In addition to the headphone and microphone jacks incorporated into the a7S's design, the top Multi Interface terminal can also be used in conjunction with an optional XLR Adapter Microphone Kit to enable the use of professional microphone systems.

Body Design

Revolving around a compact, sleek body design, the a7S features both a large rear LCD monitor as well as a bright electronic viewfinder. The rear 3.0" 921.6k-dot Xtra Fine LCD features a tilting design (up 90° and down 45°) to benefit working from both high and low angles. Also benefitting visibility with the rear monitor is the incorporation of WhiteMagic technology, which noticeably increases brightness for easier viewing in sunlit conditions. When shooting at eye-level, the 0.5" XGA OLED electronic viewfinder features a high 0.71x magnification and a 2.36 million-dot resolution for precise monitoring capabilities.

Built-In Wi-Fi Connectivity with NFC

Built-in Wi-Fi connectivity enables the a7S to instantly share imagery to mobile devices for direct sharing online to social networking, via email, and to cloud storage sites. NFC (Near Field Communication) is also supported, which allows for one-touch connection between the camera and compatible mobile devices; no complex set-up is required. Once connected, the linked mobile device can also display a live view image on its screen and remotely control the camera's shutter.

Additionally, PlayMemories Camera Apps are also supported via the built-in Wi-Fi connection, and allow you to personalize the camera's features depending on specific shooting styles. Apps are available to suit creating portraits, detailed close-ups, sports, time lapse, motion shot, and other specific types of imagery.